Abstract: A watercraft is provided with a propulsion system having a hydraulic power plant driving a propeller through a transmission. The power to operate hydraulic pumps in the power plant is derived from wave motion by buoyant members connected to the power plant by outrigger arms. Undulation of the waves is converted to fluid pressure by the vertical movement of the buoyant members reciprocating pistons in the hydraulic pumps. Pressurized fluid is applied to a fluid motor driving the transmission. A steering assembly is operatively associated with one of the buoyant members.

Abstract: A lock for a revolving door includes an electrically-controlled, solenoid-extensible trip rod engageable by a panel of the door. Movement of the rod by the door panel rotates a key from a lock holder to release a spring-biased locking element which is forced onto the door panel to prevent further rotation of the door.

Abstract: A rotor chamber and cooperating lubricant passages are defined within an engine housing having a plurality of heat-transfer fins on the exterior surface thereof. A rotor having fluid passages therein is rotatably disposed within the chamber on a shaft, and a pair of lever wheels is rotatably supported within recessed chambers provided in the rotor. Rotatable combustion chambers are defined between adjacent lever arms, and the end of each lever arm engages arm-receiving recesses disposed about the rotor chamber periphery. Cooling and exhaust fans are coaxially supported on the rotor shaft to draw cooling air over the engine casing and to extract exhaust gases from the engine, respectively. The tip and sides of each lever arm are provided with pivotal sealing elements biased into contact with the surfaces of the recessed chambers to provide sealing forces proportional to the pressure of the combustion gases.